After completing a Hollywood Hills contract from the Ubisoft sponsor (invisible rider, finish under 2:30ish, drive on one wheel) and viewing the replay, any course chosen or replay viewed had no engine sounds or lighting effects. Brakes heating up the rims still showed up. I'm not sure if this matters or not, but playing that contract was the first time I played the course. To get engine sounds back, I had to exit and reload the game.

